JP6019115B2 - Liquid detection sensor - Google Patents

Description

  The present invention relates to a liquid detection sensor for detecting a liquid such as water or oil.

  Conventionally, there exists a thing like patent document 1 as a sensor which detects a leak. In Patent Document 1, at least two foil-shaped electrodes that are spaced apart and parallel to each other are sandwiched between a synthetic resin tape and a synthetic resin nonwoven fabric tape, and these are fixed to each other, and the synthetic resin nonwoven fabric tape contacts the skin. There is disclosed a flexible liquid leakage detection device in which an adhesive material layer having an arbitrary shape is provided on a surface.

  In such a leakage detection device, the resistance between the electrode members (foil-like electrodes) is infinite when in a normal state where no leakage occurs, and a wet insulating sheet (a synthetic resin nonwoven fabric) when in a leakage state ), The electrode members are electrically connected to each other, resulting in a low resistance. Therefore, a detection device that detects resistance between electrode members (foil-like electrodes) is connected, and a liquid leakage state is detected by a change in resistance.

Japanese Utility Model Publication No. 5-79468

  However, in the above-described conventional case, when an event such as physical disconnection or disconnection of the detection device and the electrode member occurs, the resistance between the electrode members is always infinite. That is, in such a case, there is a problem that even if a liquid leakage state occurs, the liquid leakage detection device does not detect the liquid leakage state and indicates a normal state.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a liquid detection sensor that can detect leakage and detect errors related to the installation state.

  The liquid detection sensor of the present invention has an insulating sheet that exhibits electrical conductivity due to the presence of liquid, and has electrical conductivity and adhesiveness, and is provided in contact with one surface of the insulating sheet due to the adhesiveness. A plurality of electrode members electrically separated from each other, and a resistance member connected so as to tie the electrode members together, wherein the resistance member is based on a resistance value when the insulating sheet exhibits conductivity. And a resistance value smaller than the resistance value when the connection between the electrode members by the resistance member is released.

  According to said structure, the electrode member and the insulating sheet are made into a contact state by joining the electrode member and the insulating sheet directly by the adhesiveness of an electrode member. Therefore, the liquid can be reliably detected. Also, by measuring the resistance value between the electrode members, the leakage state in which the insulating sheet exhibits conductivity and the error state in which the connection between the electrode members by the resistance member is released (after setting the liquid detection sensor) The state in which the connection between the electrode member and the leakage detection measuring instrument is released and measurement is impossible) and the normal state (measurement ready state) other than these states can be detected. Thereby, for example, when the connection (attachment) between the electrode member and the measuring instrument is released (detached), the electrode member and the resistance member are peeled off from the insulating sheet, and the connection between the electrode member and the resistance member is released. When normal detection cannot be performed, the error status can be detected based on the resistance value, so the outside is notified to the effect that normal detection has become impossible, and the normal status is quickly restored. It becomes possible to do.

  Moreover, the liquid detection sensor of this invention WHEREIN: The said resistance member may be formed by printing a conductive ink on the said insulating sheet.

  According to said structure, a resistance member can be formed easily.

  Moreover, the liquid detection sensor of this invention WHEREIN: The said resistance member may be formed by printing a conductive ink on a base material.

  According to said structure, a resistance member can be formed easily.

  In the liquid detection sensor of the present invention, the resistance member may be a thin film layer including a resin and conductive particles.

  According to said structure, a resistance member can be easily formed only by apply | coating the material containing resin and electroconductive particle in thin film form.

  In the liquid detection sensor of the present invention, the electrode member may be formed by printing or applying a conductive adhesive on the insulating sheet and the resistance member.

  According to said structure, a liquid detection sensor can be easily formed by forming a resistance member and an electrode member by printing or application | coating.

  In the liquid detection sensor of the present invention, the electrode member is a metal layer laminated on a surface opposite to the insulating sheet in a layer formed by printing or applying the conductive adhesive. You may have.

  According to said structure, the convenience of the resistance measurement between electrode members can be improved because the electrode member has a metal layer.

  Further, the liquid detection sensor of the present invention is a first connector that connects at least one of the plurality of electrode members, and at least one or more of the plurality of electrode members, and is connected to the first connector. You may further have the 2nd connector which connects an electrode member different from an electrode member, and the measurement means which measures the resistance value between the said 1st connector and the said 2nd connector.

According to said structure, the resistance value between the 1st connector to which one or more electrode members were connected by the measurement means, and the 2nd connector to which one or more electrode members different from the 1st connector were connected Is measured. Thereby, in the normal state, since the electrode member of the first connector and the electrode member of the second connector are connected by the resistance member, the measuring means is based on the resistance value when the insulating sheet exhibits conductivity. In other words, the resistance value by the resistance member is detected. In addition, when at least a part of the insulating sheet exhibits conductivity due to leakage, any of the electrode members connected to the first connector and any of the electrode members connected to the second connector are electrically connected by the insulating sheet In this case, since the resistance value between the first connector and the second connector is lower than the resistance value of the resistance member, the liquid leakage state can be detected. Moreover, since the resistance value between the 1st connector and the 2nd connector becomes infinite when conduction by a resistance member is canceled, for example, connection of electrode members, such as a resistance member peeling from an insulating sheet It is possible to detect an error state in which is canceled.
As a result, it is possible to discriminate between the liquid leakage state and the normal state and error state of the connection based on the resistance value, so that the cause of the failure of normal detection is notified to the outside, and the normal state is quickly established. It becomes possible to recover.

  In the liquid detection sensor of the present invention, the electrode member and the resistance member may be provided in contact with one surface of the insulating sheet by transfer printing.

  According to said structure, the electrode member and the insulating sheet are made into a contact state by joining the electrode member and the insulating sheet directly by the adhesiveness of an electrode member. Therefore, the liquid can be reliably detected. Also, by measuring the resistance value between the electrode members, the leakage state in which the insulating sheet exhibits conductivity and the error state in which the connection between the electrode members by the resistance member is released (after setting the liquid detection sensor) The state in which the connection between the electrode member and the leakage detection measuring instrument is released and measurement is impossible) and the normal state (measurement ready state) other than these states can be detected. Thereby, for example, when the connection (attachment) between the electrode member and the measuring instrument is released (detached), the electrode member and the resistance member are peeled off from the insulating sheet, and the connection between the electrode member and the resistance member is released. When normal detection cannot be performed, the error status can be detected based on the resistance value, so the outside is notified to the effect that normal detection has become impossible, and the normal status is quickly restored. It becomes possible to do. There are a direct printing method and a transfer printing method for forming the electrode member and the resistance member. However, in the present invention, a plurality of electrode members are formed by a transfer printing method, so that in general gravure printing, screen printing, and rotary screen printing, the type of a substrate to be printed (insulating sheet) such as nonwoven fabric or gauze is used. Therefore, it is possible to prevent bleeding that occurs during direct printing. As a result, since the width and layer thickness of the electrode member can be easily controlled, a desired electrode member can be formed.

Moreover, the said several electrode member in this invention may have the said electroconductivity and adhesiveness by having the electroconductive adhesive containing an adhesive.
According to said structure, it has electroconductivity and adhesiveness because an electrode member has a conductive adhesive containing an adhesive. Thereby, an electrode member can be transcribe | transferred to an insulating sheet by pressurizing.

  It is possible to detect the leakage and to detect the normal state and the error state regarding the installation state.

It is explanatory drawing of a liquid detection sensor. It is explanatory drawing which shows the cross-section of a liquid detection sensor. It is explanatory drawing which shows the cross-section of a liquid detection sensor. It is a disassembled perspective view of a liquid detection sensor. It is explanatory drawing which shows the usage condition of a liquid detection sensor. It is a block diagram which shows the electric constitution of a measuring device. It is a figure which shows the flowchart of the leak detection program which a measuring apparatus performs. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor. It is explanatory drawing which shows the modification of a liquid detection sensor.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(Outline of liquid detection sensor)
As shown in FIG. 1, a liquid detection sensor 1 according to the present embodiment has an insulating sheet 4 that exhibits conductivity by the presence of a liquid, and has conductivity and adhesiveness. A plurality of electrode members 5 (electrode members 5a and 5b) which are provided in contact with each other and are electrically separated from each other, and a resistance member 8 connected so as to tie the electrode members 5 together. ing. And the resistance member 8 is a resistance value larger than the resistance value when the insulating sheet 4 exhibits conductivity, and the resistance value when the connection between the electrode members 5 by the resistance member 8 is released. Also have a small resistance value.

As described above, since the liquid detection sensor 1 is configured, the electrode member and the insulating sheet are directly joined by the adhesiveness of the electrode member, so that the liquid can be reliably detected. Further, by measuring the resistance value between the electrode members 5, the leakage state in which the insulating sheet 4 exhibits conductivity and the error state in which the connection between the electrode members 5 by the resistance member 8 is released (the liquid detection sensor is installed). After setting, it is possible to detect a state in which the connection between the electrode member 5 and the leakage detection measuring instrument is released and measurement is impossible) and a normal state (measurement ready state) other than these states. Thereby, for example, when the connection (attachment) between the electrode member 5 and the measuring instrument is released (detached), the electrode member 5 and the resistance member 8 are peeled off from the insulating sheet 4 and the connection between the electrode member and the resistance member is released. When normal detection cannot be performed, for example, the error status can be detected based on the resistance value, so the outside is informed that normal detection has become impossible, and as a result normal immediately It becomes possible to recover to the state.
Further, the liquid detection sensor 1 has a measuring device 7. Terminal portions 71 (first connector 71a and second connector 71b) of the measuring device 7 are connected to the electrode members 5a and 5b, respectively.

  Here, the “liquid” is a liquid detection object by the liquid detection sensor 1 and is not limited to a material or physical property as long as it is liquid. The liquid state means that the insulating sheet 4 is fluid enough to be impregnated. The “liquid” may be a body fluid, a chemical solution, pure water or water containing impurities, or an organic substance such as an acid, an alkali, an oil, or an organic solvent. In addition, the physical property of “liquid” may be any material that is liquefied at the ambient temperature in which the liquid detection sensor 1 is used.

  In addition, the resistance member 8 should just electrically connect the electrode members 5, and the arrangement | positioning position and aspect are not limited. For example, the resistance member 8 and the electrode member 5 may be arranged in contact with each other on the insulating sheet 4, or a cutout, a hole, or the like for fitting the resistance member 8 to the electrode member 5 may be provided. Good. The resistance member 8 may be in contact with the electrode member 5 via a conductive adhesive or the like. For example, the resistance member 8 may be sandwiched between the insulating sheet 4 and the electrode member 5, or at least a part of the electrode member 5 in contact with the insulating sheet 4 with an adhesive / conductive adhesive. May be adhered. Further, the resistance value of the resistance member 8 may be adjusted depending on the material or may be adjusted depending on the shape.

  Further, the insulating sheet 4, the resistance member 8, and the electrode member 5 may be in contact with each other in an adhesive state, or simply in contact with each other. When bonded, the first adhesive force between the insulating sheet 4 and the resistance member 8 is preferably larger than the second adhesive force between the resistance member 8 and the electrode member 5. Accordingly, the resistance member 8 and the electrode member 5 are fixed by the first adhesive layer and the second adhesive layer, so that the resistance member 8 and the electrode member 5 are formed of a planar or three-dimensional solid material such as a sheet shape or a rod shape. can do. Therefore, handling such as storage and transfer of the resistance member 8 and the electrode member 5 becomes easy. In addition, even when an external force such as impact or vibration is applied to the liquid detection sensor 1, it is difficult to cause problems such as the resistance member 8 and the electrode member 5 coming off. Furthermore, since the electrode member 5 and the resistance member 8 are bonded by the second adhesive layer having a smaller adhesive force than the first adhesive layer, the separation between the electrode member 5 and the resistance member 8 is caused by the resistance member 8 and the insulating sheet. Since there is a high possibility of being ahead of the separation from 4, the error state can be detected with high accuracy.

  Moreover, the resistance member 8 and / or the electrode member 5 may be formed by printing. Printing of the resistance member 8 and / or the electrode member 5 on the insulating sheet 4 may be performed by transfer. For example, the resistance member 8 can be easily formed by printing conductive ink (carbon ink, metal oxide such as titanium oxide or zinc oxide, and metal deposited pulverized material of silver or aluminum) on the insulating sheet 4. it can. Moreover, the electrode member 5 can be easily formed by apply | coating a conductive adhesive to the insulating sheet 4 and the resistance member 8 by printing. Moreover, the electrode member 5 may have a metal layer laminated | stacked on the surface on the opposite side to the insulating sheet 4 side of the layer formed by application | coating of a conductive adhesive. Thereby, for example, the connector from the measuring device that measures the resistance between the electrode members 5 and the electrode member 5 can be easily and reliably connected, and the convenience relating to resistance measurement can be enhanced.

  As an example of the electrode member 5, it is implement | achieved by the following structures. For example, as illustrated in FIG. 1, the electrode member 5 may have a configuration in which a conductive adhesive layer 51, a metal layer 52, and a resin layer 53 are sequentially stacked from the insulating sheet 4 side. Further, the electrode member 5 may have a configuration in which the conductive adhesive layer 51 and the metal layer 52 are sequentially laminated from the insulating sheet 4 side. Further, the electrode member 5 may be configured only with the conductive adhesive layer 51. Further, the electrode member 5 may have a configuration in which the conductive adhesive layer 51 and the resin layer 53 are sequentially laminated from the insulating sheet 4 side. In addition, you may include the adhesive bond layer which adhere | attaches each layer on these.

(Overall configuration of liquid detection sensor)
A more specific configuration of the liquid detection sensor 1 will be described with reference to FIGS.
As shown in FIG. 2, the liquid detection sensor 1 according to this embodiment includes an insulating sheet 4, an adhesive layer 9, a resistance member 8, two electrode members 5 (electrode members 5a and 5b), and an adhesive member. 6 are sequentially stacked. The liquid detection sensor 1 is fixed to the installation target such that the insulating sheet 4 side is in contact with the installation target. The liquid detection sensor 1 may be provided with a release sheet 3 having the same shape as the outer shape of the adhesive member 6.
The liquid detection sensor 1 is preferably sterilized for medical use. In particular, the liquid detection sensor 1 is preferably sterilized with ethylene oxide gas (EOG).
The adhesive layer 9 may be omitted when the resistance member 8 is formed on the insulating sheet by printing, coating, vacuum deposition, sputtering, or the like.

(Liquid detection sensor: insulation sheet 4)
The insulating sheet 4 has a rectangular outer shape that is similar to the outer shape of the liquid detection sensor 1 and smaller than the liquid detection sensor 1, and is disposed at the center of the liquid detection sensor 1. The liquid detection sensor 1 is not limited to a square shape in plan view, and may be a polygonal shape such as a triangular shape or a pentagonal shape, or may be an elliptical shape or a circular shape. The insulating sheet 4 may have a shape similar to such a liquid detection sensor 1 or may have a different shape.

  The insulation sheet 4 has a structure that absorbs and holds the liquid while exhibiting electrical conductivity due to the presence of the liquid. That is, the insulating sheet 4 is configured to change from insulating to conductive as a whole due to the penetration of the liquid.

  The “liquid absorbing / holding structure” included in the insulating sheet 4 is not limited to the material and shape as long as the liquid that is the detection target is permeated. Examples include a nonwoven structure, a porous structure having open cells, a structure in which one or more holes are formed in a nonporous material, and a structure in which one or more slits are formed in a nonporous material. When the insulating sheet 4 is non-woven fabric or paper, even a small amount of liquid penetrates the insulating sheet 4 due to capillary action and changes from an insulating state to a conductive state. 1 can be used.

  The material of the insulating sheet 4 is not particularly limited as long as it is a material having a large electric resistance when not in contact with a liquid.

  Examples of the material of the insulating sheet 4 include cellulose such as cloth and paper, ceramic, and engineering plastic. Examples of the engineering plastic include polypropylene, crosslinked polyethylene, polyester, polybenzimidazole, aramid, polyimide, polyimideamide, polyetherimide, polyphenylene sulfide (PPS), polyethylene naphthalate (PEN), and polyethylene terephthalate (PET).

  Specifically, a nonwoven fabric made of polyester resin manufactured by Ozu Sangyo Co., Ltd., Asahi Kasei Fibers Co., Ltd. or Unitika Ltd. can be used for the insulating sheet 4. This nonwoven fabric has hydrophilicity because the resin for adhering the polyester fibers is a water-soluble acrylic resin.

  The thickness of the insulating sheet 4 is preferably 10 to 3000 μm. Moreover, it is preferable that the insulating sheet 4 has lyophilicity with respect to the liquid which is a detection target. For example, if the liquid is water, the lyophilic property is referred to as hydrophilic. With a configuration having lyophilicity, even a small amount of liquid penetrates into the insulating sheet 4 and changes from an insulating state to a conductive state, so even a small amount of liquid can be detected. It can be set as the liquid detection sensor 1 which shortens time.

  Note that the insulating sheet may be a material having a lyophilic property or having a lyophilic layer formed on the surface of a lyophobic material. For example, in the insulating sheet 4, a surfactant having surface activity with respect to the liquid may be attached to at least a part of the contact portion with the liquid in the liquid absorption / holding structure. In this case, the liquid detection sensor 1 that can select a detection target such as water or oil can be obtained by properly using the type of the surfactant according to the type of the liquid to be detected.

  Furthermore, the insulating sheet 4 may have a coloring member whose color changes depending on the liquid. As a coloring member, the structure which sealed colorants, such as dye, in the capsule which melt | dissolves in the liquid which consists of solvents, such as water and oil, can be illustrated. In this case, when the capsule is melted by the liquid, the color of the insulating sheet 4 changes due to the flow of the sealed colorant. Therefore, the liquid detection sensor 1 can detect the liquid leakage visually. Can do.

  Furthermore, the insulating sheet 4 may be attached with a dissolving material (inorganic salts: polysaccharides such as sodium chloride, sodium sulfate, calcium chloride, magnesium hydroxide, and starch) that is dissolved and ionized in a liquid. In this case, even if the liquid itself has no conductivity (such as oil), the dissolved material ionized by the liquid can change the insulating sheet 4 to be conductive.

(Liquid detection sensor: electrode member 5, resistance member 8)
In this embodiment, as shown in FIG. 2, the liquid detection sensor 1 is provided with two electrode members 5 (electrode members 5a and 5b). Signal lines such as measuring devices are connected to the electrode members 5a and 5b, respectively. Thereby, it becomes possible to detect conduction between the two electrode members 5a and 5b due to the insulating sheet 4 exhibiting conductivity due to leakage or the like.

The electrode members 5a and 5b are arranged so that their longitudinal directions are parallel to each other. The electrode members 5a and 5b are arranged with a predetermined interval so as to be electrically separated from each other. The predetermined interval means an interval that does not malfunction due to the humidity of the atmosphere in which the liquid detection sensor 1 is installed.
The resistance member 8 is provided so as to be in contact with the electrode members 5a and 5b perpendicularly to the electrode members 5a and 5b arranged in parallel. The resistance member 8 is bonded to the insulating sheet 4 by the adhesive layer 9 so as to be sandwiched between the insulating sheet 4 and the electrode member 5.
When the resistance value between the electrode members 5 is measured due to the presence of the resistance member 8, the leakage state in which the insulating sheet 4 exhibits conductivity and the error state in which the connection between the electrode members 5 by the resistance member 8 is released. (After setting the liquid detection sensor, the connection between the electrode member 5 and the leakage detection measuring instrument is released and measurement is impossible) and normal states other than these states (measurement ready state) are detected. be able to.

  The electrode members 5a and 5b have adhesiveness on one surface side of the insulating sheet 4, and are provided in contact with the one surface of the insulating sheet 4 due to the adhesiveness. The electrode members 5a and 5b are bonded to the insulating sheet 4 in such a manner that one end thereof protrudes from the insulating sheet 4 respectively. That is, the tip portions of the electrode members 5 a and 5 b are located outside the insulating sheet 4. As a result, the electrode members 5a and 5b are exposed to the outside during the preparation stage for installing the liquid detection sensor 1, and the work of connecting to the signal line of the measuring device or the like is simplified. .

As shown in FIG. 3, the electrode members 5a and 5b have a configuration in which a protective layer 50, a conductive adhesive layer 51, and a metal layer 52 are sequentially laminated. As shown in FIG. 4, the conductive adhesive layer 51 and the metal layer 52 have the same outer shape and are laminated so as to be overlapped.
The protective layer 50 and the metal layer 52 are bonded to both surfaces of the conductive adhesive layer 51 by the adhesiveness of the conductive adhesive layer 51. The conductive adhesive layer 51 is preferably disposed on the entire surface of the metal layer 52 at least at a portion where the protective layer 50 is not laminated. In addition, about the location where the protective layer 50 is laminated | stacked, you may disperse | distribute and may arrange | position to all the joining surfaces of the protective layer 50 and the metal layer 52. FIG.

Thus, the protective layer 50 is laminated | stacked so that the one end part of electrode member 5a * 5b may be covered. That is, the electrode members 5a and 5b have a laminated structure, a portion made of the protective layer 50, the conductive adhesive layer 51, and the metal layer 52, and a portion made of the conductive adhesive layer 51 and the metal layer 52. have.
More specifically, as shown in FIG. 3, the electrode members 5 a and 5 b are formed by sequentially laminating a conductive adhesive layer 51 and a metal layer 52, and in one end region of the conductive adhesive layer 51. A protective layer 50 is laminated. The electrode members 5a and 5b are covered with the insulating sheet 4 at a portion where only the conductive adhesive layer 51 and the metal layer 52 are laminated, and at least a part of the portion where the protective layer 50 is laminated. Is covered. In addition, it is not limited to this, The location where the protective layer 50 is laminated | stacked may not be covered with the insulating sheet 4. FIG. In other words, the electrode members 5 a and 5 b may be laminated only at a place where the protective layer 50 is exposed from the insulating sheet 4.

  Thus, in this embodiment, electrode member 5a * 5b is arrange | positioned so that a part of location laminated | stacked by the protective layer 50, the conductive adhesive layer 51, and the metal layer 52 may be exposed from the insulating sheet 4. FIG. Is done. In other words, the electrode members 5 a and 5 b are partially exposed from the insulating sheet 4 where the protective layer 50 is laminated. Thereby, when the electrode member 5 contacts the installation object, the protective layer 50 can prevent direct contact between the conductive adhesive layer 51 and the installation object. The protective layer 50 is preferably an insulating layer.

(Liquid detection sensor: electrode member 5: metal layer 52)
The metal layer 52 is provided on the most adhesive member 6 side of the electrode member 5. The metal layer 52 is a metal foil or a metal thin film.

The metal layer 52 is not limited to a metal foil obtained by rolling, a metal foil obtained by electrolysis (such as a special electrolytic copper foil), and a rectangular wire, but vacuum deposition, sputtering, CVD, MO (metal organic), plating, and printing. A metal thin film formed by, for example, may be used.
The lower limit of the thickness of the metal layer 52 is 0.05 μm, and the upper limit of the thickness is 200 μm. In addition, when the metal layer 52 is formed by sputtering or vapor deposition, a thickness of 0.05 to 1 μm is preferable. When the metal layer 52 is formed by the conductive ink printing method, a thickness of 2 to 200 μm is preferable. When the metal layer 52 is formed of a metal foil, the thickness is preferably 2 to 100 μm.

  The metal layer 52 may be made of any material as long as it has conductivity, but is preferably a metal such as aluminum or copper. The metal material for forming the metal layer 52 may be nickel, copper, silver, tin, gold, palladium, aluminum, chromium, titanium, zinc, or an alloy containing two or more thereof. Good.

  Furthermore, the metal layer 52 is particularly preferably a metal foil or a rectangular wire. In this case, the electrical resistance is small and the detection time can be shortened.

(Liquid detection sensor: electrode member 5: conductive adhesive layer 51)
The conductive adhesive layer 51 is formed by being applied to the metal layer 52. The lower limit of the thickness of the conductive adhesive layer 51 is preferably 1 μm, and the upper limit of the thickness is preferably 1000 μm, but is not limited to this depending on the application.

  The conductive adhesive layer 51 is a mixture containing conductive particles and an adhesive resin. The conductive particles have an average particle diameter of 0.1 to 50 μm, and 10 to 250 parts by weight are blended with 100 parts by weight of the adhesive resin. The shape of the conductive particles is not limited to a spherical shape, a needle shape, a fiber shape, a scale shape (flake shape), a dendritic shape, or the like.

  Examples of the adhesive resin included in the conductive adhesive layer 51 include thermoplastic resins such as polyethylene, polypropylene, polyester, polyamide, acrylic, and urethane that are bonded by heating and pressurization, phenolic, and epoxy. Adhesives such as thermosetting resins such as melamine-based, melamine-based, and alkyd-based. The adhesive resin contained in the conductive adhesive layer 51 includes pressure-sensitive adhesives such as acrylic resin, silicon resin, thermoplastic elastomer resin, rubber resin, and polyester resin that are bonded at room temperature and pressure. Can be mentioned. A conductive adhesive and a conductive pressure-sensitive adhesive are formed by mixing conductive particles with the adhesive and the pressure-sensitive adhesive, respectively. The adhesive or pressure-sensitive adhesive may be a single resin or a mixture of the resins.

  Part or all of the conductive particles contained in the conductive adhesive layer 51 are formed of a metal material. For example, conductive particles include copper powder, silver powder, nickel powder, silver coat copper powder (Ag coated Cu powder), gold coated copper powder, silver coated nickel powder (Ag coated Ni powder), and gold coated nickel powder. These metal powders can be produced by a water atomization method, a carbonyl method or the like. In addition to the above, particles obtained by coating a metal powder with a resin and particles obtained by coating a resin with a metal powder can also be used. In addition, it is preferable that electroconductive particle is Ag coat Cu powder or Ag coat Ni powder. This is because conductive particles having improved conductivity can be obtained from an inexpensive material.

(Liquid detection sensor: electrode member 5: protective layer 50)
The protective layer 50 covers the electrode member 5 so that the conductive portion exposed from the insulating sheet 4 does not come into contact with the installation location of the liquid detection sensor 1. Moreover, you may cover with the protective layer 50 except the location pinched | interposed into an electrode member by a clip electrode part. In addition, by providing the overcoat resin layer such as the protective layer 50 in this way, it is possible to prevent poor conduction of the electrode member 5 and the resistance member 8 due to the insulating sheet 4 being stretched by an external force. Therefore, it is possible to avoid the formation of a non-conductive portion in each of the electrode members 5 and to prevent a decrease in the liquid detection range. The overcoat resin layer may be provided with a plurality of holes penetrating the resin layer. As a result, moisture is released together with air, so that malfunction due to moisture can be prevented. The protective layer 50 is bonded to the conductive adhesive layer 51 by the adhesiveness of the conductive adhesive layer 51.

  The protective layer 50 may be formed of paper or non-woven fabric, or may be formed of an epoxy resin, a polyester resin, an acrylic resin, a phenol resin, a urethane resin, or a mixture thereof. In addition, although the thickness of the protective layer 50 is 5-200 micrometers, it does not need to be specifically limited and can be set suitably. Moreover, when the protective layer 50 is formed of a PET film, it is desirable that the surface of the PET film is subjected to a hydrophilic treatment. The hydrophilic treatment is a hydrophilic resin coat, corona treatment, plasma treatment, or the like. Moreover, the protective layer 50 can use what was mentioned as a material of the overcoat resin layer 1110 mentioned later.

(Liquid detection sensor: resistance member 8, adhesive layer 9)
The resistance member 8 is provided so as to be in contact with the electrode members 5a and 5b perpendicularly to the electrode members 5a and 5b arranged in parallel. Although the thickness of the resistance member 8 is 0.1-30 micrometers, it does not need to be specifically limited and can be set suitably. The resistance member 8 is bonded to the insulating sheet 4 by the adhesive layer 9 so as to be sandwiched between the insulating sheet 4 and the electrode member 5.

  The adhesive layer 9 is made of an adhesive substance, and examples thereof include acrylic resins, silicon resins, thermoplastic elastomer resins, rubber resins, and polyester resins. Moreover, the adhesive substance may further contain a tackifier. Examples of the tackifier include tackifiers such as fatty acid hydrocarbon resins, C5 / C9 mixed resins, rosins, rosin derivatives, special resins, terpene resins, aromatic hydrocarbon resins, and heat-reactive resins.

The resistance member 8 may be any material as long as it has conductivity and can be set to a value larger than the resistance value when the insulating sheet 4 exhibits conductivity. Carbon is preferred. In particular, in addition to carbon inks using carbon black such as Ketjen Black (trademark), conductive inks such as metal oxides such as titanium oxide and zinc oxide, and metal deposition pulverized materials of silver and aluminum are used for the insulating sheet 4 and the base. It is preferably formed by printing on a material. Examples of the base material include cellulose such as cloth and paper, ceramics, and engineering plastics. Engineering plastics include polypropylene, crosslinked polyethylene, polyester, polybenzimidazole, aramid, polyimide, polyimideamide, polyetherimide, polyphenylene sulfide (PPS), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), and the like.
Moreover, the structure which makes a metal particle, such as nickel and aluminum adhere to the insulating sheet 4, and makes the some electrode member 5 contact the adhered part may be sufficient.
Further, the resistance member 8 may be a thin film layer containing a resin and conductive particles. Thereby, a resistance member can be easily formed only by apply | coating the conductive adhesive containing resin and electroconductive particle to the insulating sheet 4 or a base material in thin film form. As an example of the material of the resin and the conductive particles, those mentioned in the conductive adhesive layer 51 can be used. In that case, in order to obtain a resistance member, the blending ratio of the conductive particles to the resin is adjusted so as to have a predetermined resistance value.

  The lower limit of the resistance value of the resistance member 8 needs to be set as appropriate according to the resistance value of the liquid to be detected, and is set to a value larger than the resistance value at which the insulating sheet 4 exhibits conductivity and detects leakage. .

(Liquid detection sensor: adhesive member 6)
The adhesive member 6 is formed so as to hold the insulating sheet 4 and the electrode member 5 and to cover the insulating sheet 4, the electrode member 5, and the resistance member 8. The adhesive member 6 has adhesiveness at the exposed portion. Therefore, the insulating sheet 4, the electrode member 5, and the resistance member 8 of the liquid detection sensor 1 can be easily attached to a desired location by the adhesive member 6.

  Specifically, the adhesive member 6 of the liquid detection sensor 1 has a rectangular shape in plan view and is formed in a flat plate shape having a predetermined thickness. Here, the predetermined thickness refers to a thickness that allows the liquid detection sensor 1 to be bent or deformed along the shape of the installation target and to maintain a deformed state when the liquid detection sensor 1 is attached to the installation target. means.

  The adhesive member 6 has a function of fixing at least a part of the insulating sheet 4 and the electrode member 5 to the installation target. The adhesive member 6 has an adhesive 61 and an adhesive film 62.

(Liquid detection sensor: adhesive member 6: adhesive 61)
As for the adhesive 61, the area | region in an outer peripheral part is affixed on installation object. Moreover, in the center part, electrode member 5a * 5b is affixed and the insulating sheet 4 which covers electrode member 5a * 5b is affixed on the circumference | surroundings. As the adhesive 61, acrylic, natural rubber, or synthetic rubber can be used.

(Liquid detection sensor: adhesive member 6: adhesive film 62)
The pressure-sensitive adhesive 61 is formed on one surface of the pressure-sensitive adhesive film 62. The adhesive film 62 serves as a base film for the adhesive 61 and is disposed on the surface of the liquid detection sensor 1 opposite to the insulating sheet 4. The adhesive film 62 is formed in a size larger than the insulating sheet 4 and the electrode members 5a and 5b. Thereby, the adhesive film 62 impacts the insulating sheet 4 and the electrode members 5a and 5b by holding the adhesive 61 and covering the insulating sheet 4 and the electrode members 5a and 5b in the installed liquid detection sensor 1. It is designed to protect against external forces caused by rubbing and rubbing.

  Further, the adhesive film 62 may be formed of paper or non-woven fabric, or may be formed of an epoxy resin, a polyester resin, an acrylic resin, a phenol resin, a urethane resin, or a mixture thereof. . In addition, although the thickness of the film 62 for adhesion is 12-200 micrometers, it does not need to be specifically limited and can be set suitably.

(Liquid detection sensor: release sheet 3)
The release sheet 3 makes it possible to maintain the adhesiveness of the adhesive 61 over a long period of time and to exhibit the adhesiveness to the installation target of the liquid detection sensor 1 only when necessary. Thereby, the portability of the liquid detection sensor 1 becomes excellent. Further, the release sheet 3 can protect the insulating sheet 4 and the electrode members 5a and 5b with the adhesive member 6 in a state before the liquid detection sensor 1 is installed.

(Manufacturing method of liquid detection sensor)
A method of manufacturing the liquid detection sensor 1 in the above configuration will be described.

  First, a long adhesive film 62 having a width of several times or several tens of times that of the liquid detection sensor 1 is prepared in a rolled state. The adhesive film 62 is unwound and the adhesive 61 is applied to the entire upper surface (one surface) of the adhesive film 62. Next, the metal layer 52 (copper foil etc.) is adhere | attached on the resin layer 53 with an adhesive agent, a conductive adhesive agent is coated, and the sheet | seat of the electrode member 5 is produced. The electrode member 5 is formed into a pattern by arbitrarily punching this sheet with a Thomson blade and cutting the electrode member 5 3 mm wide × 2 pieces (interval 2 mm) × length direction. The electrode member 5 may be formed by patterning the conductive adhesive 51 by a screen printing method. And a pair of electrode member 5 (electrode member 5a * 5b) is mounted in the width direction and length direction of the film 62 for adhesion | attachment to which the adhesive 61 was apply | coated. As a result, a plurality of pairs of electrode members 5 are arranged in a matrix in the width direction and the length direction on the adhesive film 62.

  On the other hand, as a manufacturing method of the resistance member 8, a conductive ink such as carbon ink is applied or printed on a base material such as PET or an insulating sheet. A resistance member can also be produced on a base material such as PET or an insulating sheet by vacuum deposition, sputtering, CVD, MO (metal organic), plating, printing, or the like. Moreover, a resistance member can also be produced by adjusting the blending ratio so as to obtain a predetermined resistance value using the resin and conductive particles used for the conductive adhesive layer. The resistance member 8 manufactured in this way is placed so as to bind the electrode member 5. Thereafter, the insulating sheet 4 is placed so as to cover the pair of electrode members 5. At this time, the insulating sheet 4 is placed so that the resistance member 8 is in contact with the pair of electrode members 5. Further, if necessary, the release sheet 3 having the same size as the adhesive film 62 is covered from above the adhesive film 62. The insulating sheet 4 and the electrode members 5a and 5b are fixed to the adhesive 61 on the adhesive film 62 by being pressed by a pressing device (not shown). Thereby, as the liquid detection sensor 1, the insulating sheet 4, the electrode members 5a and 5b, and the adhesive member 6 are integrated. In addition, the peeling sheet 3 is also integrated as needed. When an intermediate product sheet in which a plurality of liquid detection sensors 1 are arranged in a matrix is created in this way, the single liquid detection sensor 1 is created by cutting or punching the intermediate product sheet.

Moreover, although this embodiment demonstrated the case where the metal layer 52 was adhere | attached on the resin layer 53 with an adhesive agent, and the sheet | seat of the electrode member 5 was produced by coating with a conductive adhesive agent, it is not limited to this. In the following modification, a case where the resistance member and the electrode member are formed by transfer printing will be described.
In other words, the liquid detection sensors (liquid detection sensors 701 and 801) of the following modifications have conductivity and adhesiveness with insulating sheets (insulating sheets 704 and 804) that exhibit conductivity by the presence of liquid. A plurality of electrode members (electrode members 705 and 805) which are provided in contact with one surface of the insulating sheet by transfer printing using the adhesive property and electrically separated from each other; And a resistance member (resistance members 708 and 808) provided on the one surface of the insulating sheet and connected to connect the electrode members to each other. That is, the electrode member 705 and the resistance member 708 are provided in contact with one surface of the insulating sheet 704 by transfer printing. An electrode member 805 and a resistance member 808 are provided in contact with one surface of the insulating sheet 804 by transfer printing.

First, referring to FIG. 13, a liquid detection sensor 701 in which two electrode members 705 and a resistance member 708 formed of a conductive adhesive layer 751 are provided in contact with one surface of an insulating sheet 704 by transfer printing. explain.
In this modification, the two electrode members 705 are constituted by a conductive adhesive layer 751 including an adhesive and conductive particles. The adhesive contained in the conductive adhesive layer 751 is preferably a polyester-based thermoplastic resin, but is not limited thereto, and can be appropriately selected from various resins having a glass transition temperature (Tg) of −30 ° C. to 5 ° C. is there. For example, urethane resins, acrylic resins, polyamide resins, polyolefin resins, polyester resins, etc. as thermoplastic resins, and epoxy resins, phenol resins, melamine resins, alkyd resins as thermosetting resins Examples thereof include resins.
Moreover, as electroconductive particle, copper powder, silver powder, nickel powder, silver coat copper powder (Ag coat Cu powder), gold coat copper powder, silver coat nickel powder (Ag coat Ni powder), gold coat nickel powder Yes, these metal powders can be produced by a water atomization method, a carbonyl method or the like. In addition to the above, particles obtained by coating a metal powder with a resin and particles obtained by coating a resin with a metal can also be used. The conductive particles preferably have an average particle diameter of 5 to 30 μm. Further, the conductive adhesive (printing ink) constituting the conductive adhesive layer 751 is preferably formed by mixing 50 to 100 parts by weight of conductive particles with respect to 100 parts by weight of the thermoplastic resin.

As shown in FIG. 13, the two electrode members 705 (conductive adhesive layer 751) are thermally transferred to the insulating sheet 704 by transfer printing. Specifically, first, a PET film 770 coated with a non-silicone release agent 771 is screen-printed with a conductive adhesive (printing ink) obtained by mixing a thermoplastic resin and conductive particles. An adhesive layer 751 is formed. Next, a conductive ink such as carbon ink is screen-printed on the conductive adhesive layer 751 as the resistance member 708. That is, a transfer film 772 in which a resistance member 708, a conductive adhesive layer 751, a non-silicon release agent 771, and a PET film 770 are sequentially laminated is formed (see FIG. 13A). Either the screen printing order of the conductive adhesive or the conductive ink may be first.
The release agent is not limited to this, and may be silicon. The layer thickness of the PET film 770 is preferably in the range of 6 μm to 150 μm, and more preferably about 25 μm.
In screen printing, it is preferable to use a polyester plate-making mesh for the printing plate. The plate-making mesh is preferably 50 mesh (number of meshes per inch) to 350 mesh, more preferably 150 mesh. The printing plate is preferably made to have an emulsion thickness of 5 μm to 100 μm, more preferably 50 μm. In addition, the conductive adhesive layer 751 is preferably printed with a layer thickness in the range of 10 μm to 50 μm.
Further, the printing method of the conductive adhesive layer 751 and the resistance member 708 is not limited to screen printing, and rotary screen printing, gravure printing, flexographic printing, die coating printing, and the like can be used.
In this modification, the transfer film 772 includes the resistance member 708, and the resistance member 708 and the conductive adhesive layer 751 are simultaneously transferred to the insulating sheet 704. However, the present invention is not limited to this. For example, only the resistance member 708 may be directly printed on the insulating sheet 704, and the conductive adhesive layer 751 may be transferred and printed onto the insulating sheet 704 on which the resistance member 708 is printed.

Then, as shown in FIG. 13B, transfer printing is performed by applying pressure and heating to the insulating sheet 704 using the transfer film 772, and the conductive adhesive layer 751 and the resistance member are applied to the insulating sheet 704. 708 is transferred. Specifically, the transfer film 772 and the insulating sheet 704 are set on two heated feed rolls, respectively. The transfer film 772 and the insulating sheet 704 are fed while being pressed by two feeding rolls while being heated by the feeding roll. This enables continuous transfer printing processing of the transfer film 772 and the insulating sheet 704 (continuous hot roll pressure transfer method). Thereafter, as shown in FIG. 13C, the non-silicon release agent 771 and the PET film 770 are peeled off to form a liquid detection sensor 701.
In such a continuous hot roll pressure transfer method, the heating temperature by the feeding roll is preferably 110 to 220 ° C, more preferably 160 to 190 ° C. Moreover, it is preferable that a pressurization time is 1 N / cm2-50 N / cm2, and a certain pressurization time is spent. Specifically, the pressurization time by the feeding roll is preferably 0.5 to 60 seconds, and more preferably 1 to 15 seconds. Transfer printing is not limited to the continuous hot roll pressurization transfer method. For example, a single wafer heat pressure transfer method in which a transfer film 772 and an insulating sheet 704 cut in advance to a predetermined size are pressed and heated by a press machine may be used. In this case, the heating temperature by the press is preferably 110 to 220 ° C, more preferably 160 to 190 ° C. Moreover, it is preferable that the pressurization force by a press machine is 1 N / cm2-50 N / cm2, and pressurization time is 1 second-10 minutes.

  Next, with reference to FIG. 14, a liquid detection sensor 801 in which the two electrode members 805 have a conductive adhesive containing an adhesive and have conductivity and adhesiveness will be described. In this modification, the two electrode members 805 are configured by a conductive adhesive layer 851 including an adhesive and conductive particles. Examples of the pressure-sensitive adhesive include acrylic resins, silicon resins, rubber resins, and polyester resins. Specific examples include KP-1581, KP-1104, KP-2074, and SZ-6153 manufactured by Nippon Carbide, and AR-2172-M3 manufactured by Big Technos. In addition, about the structure similar to the liquid detection sensor 701, description may be abbreviate | omitted using the same member name. The conductive adhesive is suitable when the adhesive force of the electrode member is not required so much.

  As shown in FIG. 14, the two electrode members 805 (conductive adhesive layer 851) and the resistance member 808 are transferred to the insulating sheet 804 by transfer printing. Specifically, first, a conductive adhesive (printing ink) in which an adhesive and conductive particles are mixed is screen-printed on a PET film 870 coated with a non-silicone release agent 871 to conduct conductive adhesion. An agent layer 851 is formed. Next, conductive ink (carbon ink) is screen-printed on the conductive adhesive layer 851 as the resistance member 808. That is, a transfer film 872 in which a resistance member 808, a conductive adhesive layer 851, a non-silicon release agent 871, and a PET film 870 are sequentially laminated is formed (see FIG. 14A).

Then, as shown in FIG. 14B, transfer printing is performed by applying pressure to the insulating sheet 804 using the transfer film 872, and the resistance member 808 and the conductive adhesive layer 851 are transferred to the insulating sheet 804. Is done. Specifically, the transfer film 872 and the insulating sheet 804 are set on two feeding rolls (non-heated), respectively. The transfer film 872 and the insulating sheet 804 are fed while being pressed between two feeding rolls. This enables continuous transfer printing processing between the transfer film 872 and the insulating sheet 804. Thereafter, as shown in FIG. 14C, the non-silicon release agent 871 and the PET film 870 are peeled off to form a liquid detection sensor 801.
In such a pressure transfer method, the heating temperature by the feeding roll is preferably 110 to 220 ° C, more preferably 160 to 190 ° C. Moreover, it is preferable to spend a certain pressurizing time at a pressing force of 5 N / cm 2 to 50 N / cm 2. Specifically, the pressurization time by the feeding roll is preferably 0.5 to 60 seconds, and more preferably 1 to 15 seconds. Transfer printing is not limited to the continuous hot roll pressurization transfer method. For example, a single-wafer heat pressure transfer method in which a transfer film 872 and an insulating sheet 804 cut in advance to a predetermined size are pressed and heated by a press machine may be used. In this case, the heating temperature by the press is preferably 110 to 220 ° C, more preferably 160 to 190 ° C. Moreover, it is preferable that the pressurization force by a press machine is 5 N / cm2-50N / cm2, and pressurization time is 1 second-10 minutes.

  Further, when the electrode member is exposed from an insulating sheet or other structure and visible from the outside like the liquid detection sensor 601 in FIG. 12, a nonwoven fabric or the like is used so that the exposed electrode member cannot be seen. A cover member may be provided. Specifically, as shown in FIG. 15, in the liquid detection sensor 901, the electrode member 905 is exposed from the insulating sheet 904, but the cover member 907 is provided on the surface of the electrode member 905 opposite to the insulating sheet 904. It has been. Accordingly, even when the surface on the insulating sheet 904 side is attached to a person's arm or the like, it is possible to prevent the electrode member 905 from being exposed and not to touch the skin. In FIG. 15, the resistance member is omitted.

  In addition, as shown in FIG. 16, the electrode member 1005 disposed so as to face the resistance member 1008 on the insulating sheet 1004 has a plurality of convex portions 1005 a on the opposite side, and two electrode members The liquid detection sensor 1001 may have a shape in which the gap formed by 1005 is bent. Thereby, the detection area of a liquid leak can be increased and the precision of a liquid leak detection can be improved.

  Moreover, as shown in the perspective views of FIGS. 17 and 18, a conductive ink (conductive paste) may be used for the electrode member. Specifically, the liquid detection sensor 1101 in FIG. 17 includes an insulating sheet 1104, a plurality of electrode members 1105 (electrode members 1105a and 1105b), and a resistance member 1108. The electrode members 1105a and 1105b are conductive ink (conductive paste). The electrode members 1105a and 1105b are formed by being applied or printed on the insulating sheet 1104 in a separated state. The resistance member 1108 is a conductive ink (conductive paste). The resistance member 1108 is formed by being laminated so as to straddle the electrode members 1105a and 1105b by coating or printing. Alternatively, the electrode member 1105 and the resistance member 1108 may be screen-printed on a base material and transferred to an insulating sheet. Thus, the electrode members 1105a and 1105b that are electrically separated are connected by the resistance member 1108. The resistance member 1108 has a resistance value that is larger than the resistance value when the insulating sheet 1104 exhibits conductivity, and a resistance value that is smaller than the resistance value when the connection between the electrode members by the resistance member 1108 is released. Has a value.

The electrode members 1105a and 1105b are provided in parallel on the insulating sheet 1104, and each extend from one end of the insulating sheet 1104 to the other opposite end. Accordingly, as shown in the plan view at the bottom of FIG. 17, the liquid detection sensor 1101 can be formed simply by forming it in a long shape in advance and cutting it to a predetermined size, thereby reducing productivity and cost. It is possible. In addition, it is possible to cut the shape into a desired size and use it, thereby improving the convenience.
The resistance member 1108 may be stacked before the long liquid detection sensor 1101 is cut. Further, the resistance member 1108 may be laminated after cutting the liquid detection sensor 1101 formed in a long shape.

  18 includes an insulating sheet 1204, a plurality of electrode members 1205 (electrode members 1205 a and 1205 b), and a resistance member 1208. The resistance member 1208 is a conductive ink (conductive paste). The resistance member 1208 is formed by being laminated on the entire surface on one side of the insulating sheet 1204 by coating or printing. The electrode members 1205a and 1205b are conductive ink (conductive paste). The electrode members 1205a and 1205b are formed by being applied or printed on the resistance member 1208 in a separated state. As a result, the electrode members 1205a and 1205b that are electrically separated are connected by the resistance member 1208. The resistance member 1208 has a resistance value that is larger than the resistance value when the insulating sheet 1204 exhibits conductivity, and a resistance value that is smaller than the resistance value when the connection between the electrode members by the resistance member 1208 is released. Has a value.

  The resistance member 1208 is laminated on the entire surface of one side of the insulating sheet 1204, and the electrode members 1205a and 1205b are provided in parallel on the resistance member 1108, and each extends from one end of the insulating sheet 1204 to the opposite opposite end. Yes. Accordingly, as shown in the plan view at the bottom of FIG. 18, the liquid detection sensor 1201 can be formed simply by forming it in a long shape in advance and cutting it into a predetermined size, thereby improving productivity and reducing costs. It is possible to plan. In addition, it is possible to cut the shape into a desired size and use it, thereby improving the convenience.

  Note that an overcoat resin layer 1110 may be provided on one surface of the liquid detection sensor 1101 of FIG. 17 where the electrode members 1105a and 1105b are provided. The overcoat resin layer 1110 is laminated with resin so as to cover the entire surface of the liquid detection sensor 1101 except for the insulating sheet 1104 at one end and the electrode members 1105a and 1105b sandwiched by the clip on one side of the liquid detection sensor 1101. Has been formed. Thereby, the conduction failure of the electrode members 1105a and 1105b and the resistance member 1108 due to the insulating sheet 1104 extending by an external force can be prevented. Therefore, it is possible to avoid the formation of a non-conductive portion in each of the electrode members 1105a and 1105b, and to prevent a decrease in the liquid detection range. Further, it is possible to avoid the formation of a non-conducting portion in the resistance member 1108 and to prevent erroneous detection of an error state. The overcoat resin layer may be provided with a plurality of holes penetrating the resin layer. As a result, moisture is released together with air, so that malfunction due to moisture can be prevented. Here, the “one end portion sandwiched between clips” is not limited to only a portion sandwiched between clips. For example, an aspect in which at least a part of each of the plurality of electrode members is exposed from the overcoat resin layer may be employed. That is, it is only necessary that each of the plurality of electrode members be connectable to the measuring apparatus. Similarly, an overcoat resin layer 1210 may be provided on one surface of the liquid detection sensor 1201 where the electrode members 1205a and 1205b are provided.

The conductive ink used for the resistance members 1108 and 1208 is a metal-based powder (metal powder, metal compound (sulfide or chloride of various metals) that is conductive particles against a thermosetting resin or thermoplastic resin dissolved in a solvent. Etc.)) or carbon powder. As a material for the thermosetting resin, epoxy, alkyd, and the like are preferable. As a material of the thermoplastic resin, polyester, polyurethane, acrylic, vinyl chloride, or the like is preferable. Among these, epoxy, polyester, polyurethane, and acrylic are preferable, and epoxy, polyester, and polyurethane are more preferable. The blending ratio in the conductive ink is appropriately selected depending on the printing method, the type of conductive particles, the thickness of the conductive ink, etc. with respect to the target resistance value.
As an example, in order to change the resistance value of the resistance member from 50 kΩ to 300 kΩ, screen printing is performed on a base material containing 35 parts by mass of polyester, 3 parts by mass of graphite-based carbon powder, and 65 parts by mass of butyl carbitol acetate. Is thermally transferred to an insulating sheet. The thickness of the heat-transferred resistance member is 8 μm after drying.

  The resistance member 1208 preferably has an anisotropic conductive adhesive property. That is, the resistance member 1208 has a resistance value (a resistance value in the layer thickness direction) that can ensure a good electrical conduction state in the layer thickness direction, and a resistance higher than the resistance value in the layer thickness direction in the plane direction perpendicular to the layer thickness direction. Value (surface direction resistance value). Accordingly, as shown in FIG. 19, when the insulating sheet 1204 is not in the liquid leakage state, the current for detecting the resistance value flows from the one electrode member 1205 to the surface of the resistance member 1208 and then to the other electrode member. 1205 will be reached. Further, when the insulating sheet 1204 is in a liquid leakage state, as shown in FIG. 20, the current for resistance value detection flows from the one electrode member 1205 through the resistance member 1208 in the layer thickness direction, and then the insulating sheet 1204 passes through the resistance member 1208 again in the layer thickness direction and reaches the other electrode member 1205.

  In this way, the resistance value can be made different between the case where the liquid detection sensor 1201 is in the measurement ready state and the case where the liquid detection sensor 1201 is in the liquid leakage state.

The conductive ink used for the electrode members 1105 and 1205 is a metal-based powder (metal powder, metal compound (sulfide or chloride of various metals) that is conductive particles against a thermosetting resin or thermoplastic resin dissolved in a solvent. Etc.)) or carbon powder. As a material for the thermosetting resin, epoxy, alkyd, and the like are preferable. As a material of the thermoplastic resin, polyester, polyurethane, acrylic, vinyl chloride, or the like is preferable. Among the thermosetting resins, epoxy is more preferable. Of the thermoplastic resins, polyester, polyurethane and acrylic are more preferable, and polyester and polyurethane are more preferable. The conductive particles are preferably silver powder. As for the ratio of the silver powder in the conductive ink, the lower limit is preferably 10 parts by mass and the upper limit is preferably 85 parts by mass with respect to 35 parts by mass of the thermosetting resin or the thermoplastic resin. Further, the ratio of the solvent in the conductive ink is appropriately selected according to the printing method, the type of conductive particles, the thickness of the conductive ink, etc., with respect to the target resistance value.
As an example, in order to change the resistance value of an electrode member from 100Ω to 300Ω, screen printing is performed on a base material containing 35 parts by mass of polyester, 65 parts by mass of silver powder, and 65 parts by mass of butyl carbitol acetate, and this is an insulating sheet. Heat transfer to. The thickness of the thermally transferred electrode member is 20 μm after drying.

  In addition, the conductive particles used for the conductive ink may be scale-like (flakes), circular (oval, egg-shaped, etc., as long as the corners are rounded), dendrite shape, needle shape, chain shape, A spike shape or the like can be used, but a scale shape is preferable. That is, since the conductive particles are scale-like, the conduction of the electrode members 1105 and 1205 itself can be maintained even when the electrode members 1105 and 1205 are deformed due to the elongation of the insulating sheets 1104 and 1204. Because.

  The overcoat resin layers 1110 and 1210 are made of a thermosetting resin or a thermoplastic resin dissolved in a solvent. The overcoat resin layers 1110 and 1210 are preferably made of epoxy, alkyd, or the like as the thermosetting resin material. As a material of the thermoplastic resin, polyester, polyurethane, acrylic, vinyl chloride, or the like is preferable. When the resin layers 1110 and 1210 are colored, for example, white pigments such as zinc white (zinc oxide) and titanium white (titanium oxide) may be mixed. Moreover, you may mix | blend an antiblocking agent etc. suitably. Among the thermosetting resins, epoxy is more preferable. Of the thermoplastic resins, polyester, polyurethane and acrylic are more preferable, and polyester and polyurethane are more preferable. As for the ratio of the titanium oxide in overcoat resin, it is preferable that a minimum is 15 mass parts and an upper limit is 30 mass parts with respect to 35 mass parts of thermoplastic resins. Further, the ratio of the blocking agent in the overcoat resin is preferably 3 parts by mass with respect to 35 parts by mass of the thermoplastic resin, and preferably 10 parts by mass with respect to the upper limit. Moreover, it is preferable that the minimum of a ratio of the solvent in overcoat resin is 5 mass parts with respect to 35 mass parts of thermoplastic resins, and an upper limit is 30 mass parts.

(Application example of liquid detection sensor)
The sheet-like liquid detection sensor 1 manufactured as described above is put together in a stacked state in which a plurality of sheets are batched. And these liquid detection sensors 1 are stored in storage means, such as a worker's pocket and a tool case. That is, the liquid detection sensor 1 can be stored while being carried by an operator like a bandage with gauze.

  As shown in FIG. 5, when there is an installation target 2 of a device or a place where it is desired to detect the presence or absence of liquid leakage, first, if the liquid detection sensor 1 includes the release sheet 3, the release sheet 3 is peeled off and the release is performed. If the liquid detection sensor 1 does not include the sheet 3, it is prepared as it is.

  Next, the electrode members 5a and 5b are pulled up from the surface of the adhesive member 6 where the adhesive 61 is formed, and are connected to the first connector 71a and the second connector 71b of the measuring device 7, respectively. As shown in FIG. 5, the end portions of the first connector 71a and the second connector 71b are formed in a clip shape to electrically connect the electrode members 5a and 5b and to connect the electrode members 5a and 5b. A stable connection can be maintained by pinching. Thus, the electrode members 5a and 5b are connected so that the measuring device 7 can detect the resistance value. Then, the liquid detection sensor 1 is moved so that the formation surface of the adhesive 61 in the adhesive member 6 contacts the installation target 2, and the liquid detection sensor 1 is pressed against the installation target 2. Thereby, the liquid detection sensor 1 is adhered in a state in which the insulating sheet 4 is in contact with a desired portion of the installation target 2. As a result, even when the installation object 2 moves or vibrates, the liquid detection sensor 1 continues to detect liquid leakage without causing a positional shift.

  When liquid leakage occurs in the installation target 2, the insulating sheet 4 exhibits conductivity when the liquid is infiltrated. As a result, the electrode members 5 a and 5 b that are conducted only by the resistance member 8 are also electrically connected through the insulating sheet 4. Since the insulating sheet 4 exhibiting conductivity has a lower resistance value than the resistance member 8, the electrical resistance indicated by the measuring device 7 also changes to a lower resistance value. As a result, leakage is detected.

  In addition, when the connection between the resistance member 8 and the electrode member 5 or the connection between the electrode member 5 and the measurement device 7 is released for some reason, the electrical resistance indicated by the measurement device 7 is higher than that of the resistance member 8. Will change to a value. Thereby, an error in the installation state of the liquid detection sensor 1 is detected.

  When an abnormality occurs due to such liquid leakage, the liquid detection sensor 1 that has detected the liquid is peeled off from the installation target 2 by an operator and replaced with an unused liquid detection sensor 1. In this manner, the liquid detection sensor 1 can be used in a disposable use form such as a bandage with gauze. Note that the used liquid detection sensor 1 may be reused by drying the soaked liquid. In the case of an error state, the liquid detection sensor 1 is installed again in a normal state by an operator.

  As illustrated in FIG. 5, the installation target 2 is exemplified by a human arm or a leg when the liquid detection sensor 1 is applied to medical treatment. In this case, the indwelling needle 12 may come off during treatment such as dialysis, blood transfusion, infusion, etc., and blood / drug solution may leak. However, if the liquid detection sensor 1 is attached to the puncture portion, the blood / drug solution Leakage and abnormal installation of the liquid detection sensor 1 can be detected. At this time, since the liquid detection sensor 1 is directly attached to the puncture portion, even a small amount of liquid leakage can be detected. In addition, since the liquid detection sensor 1 is directly attached to the puncture portion such as an arm or a leg, when the indwelling needle is removed due to the movement of the arm or the leg, the connection between the electrode member of the liquid detection sensor 1 and the measuring device 7 is performed. Since the connectors used in the above are disconnected together, an error in the installation state of the liquid detection sensor 1 can be detected, and the needle removal can also be detected.

(Liquid detection sensor: measuring device 7)
Here, the measuring device 7 will be described.
The measuring device 7 has a function of detecting a resistance value between the electrode members 5a and 5b by being connected to the electrode members 5a and 5b as described above. Thereby, the states (normal state, liquid leakage state, and error state) of the detected portion 70 (insulating sheet 4 and the like) can be detected.

  Specifically, as illustrated in FIG. 6, the measurement device 7 includes a calculation unit 79, a terminal unit 71, an A / D conversion unit 77, an input unit 73, a speaker 74, a display unit 72, a power supply unit 75, a communication interface 76, A ROM 781 and a RAM 782 are included.

  As described above, the terminal unit 71 detects the resistance value of the detected unit 70 and transmits the resistance value to the calculation unit 79 via the A / D conversion unit 77. The calculation unit 79 executes various programs and controls operations of various actuators by supplying power from the power supply unit 75. Specifically, the calculation unit 79 determines a state of the detected unit 70 based on a resistance value from the terminal unit 71 by using a leak detection program described later. Various programs such as a leakage detection program are stored in the storage means of the ROM 781 and the RAM 782. In addition, the calculation unit 79 notifies the state of the detected unit 70 to the display unit 72 such as a speaker 74 or a liquid crystal display device according to the determined state of the detected unit 70. In addition, by using an input unit 73 such as a switch, a keyboard, and a mouse, detection start / end and setting of a threshold value for determining the state of the detected unit 70 and the like can be performed. Such set values are stored in the RAM 782.

  In addition, the calculation unit 79 can output a signal based on the state of the detected unit 70 to the outside via the communication interface 76. For example, when a liquid leak from the installation target 2 is detected, a signal can be output to another system. For example, an alarm to a remote location or an automatic response at the time of a liquid leak (for example, the installation target 2) The system related to the system can be automatically stopped).

Next, a liquid leakage detection program executed by the calculation unit 79 will be described. In the present embodiment, the resistance value between the electrode members 5a and 5b is referred to as a sensor resistance value.
As shown in FIG. 7, it is first determined whether or not a start operation has been performed (S1). Specifically, it is determined whether a start operation is performed from the outside in the input unit 73 and a signal indicating the operation is transmitted to the calculation unit 79. When the start operation is not performed (S1: NO), the process of S1 is executed again. That is, a standby state for waiting for the start operation is entered.

  On the other hand, when the start operation is performed (S1: YES), the sensor resistance value is acquired (S2). Thereafter, an error threshold is determined (S3). Specifically, the error threshold is a threshold for determining an error state in which the connection between the electrode members 5a and 5b becomes defective. Note that the error threshold may be set to a value (resistance value is infinite) at which the electrode members 5a and 5b are completely non-conductive. In the present embodiment, a value obtained by adding the first predetermined value to the sensor resistance value when the liquid detection sensor 1 is installed on the installation target 2 is set as the error threshold. The first predetermined value is appropriately set in advance according to the installation target environment.

  Then, a leak threshold is determined (S4). Specifically, the liquid leakage threshold value is a threshold value for determining a liquid leakage state in which the insulating sheet 4 exhibits electrical conductivity due to liquid leakage and the electrode members 5a and 5b are electrically connected by the insulating sheet 4. In the liquid detection sensor 1, the resistance value of the resistance member 8 is set to be larger than that of the insulating sheet 4 that exhibits conductivity. Therefore, the leakage threshold is between the insulating sheet 4 that exhibits conductivity and the resistance member 8. The resistance value is set. In the present embodiment, a value obtained by subtracting the second predetermined value from the sensor resistance value when the liquid detection sensor 1 is installed on the installation target 2 is set as a liquid leakage threshold value. The second predetermined value is appropriately set in advance according to the physical properties of the insulating sheet 4 and the liquid for detecting leakage.

  As described above, by setting the threshold value for each liquid detection sensor 1, even if the resistance value is different for each liquid detection sensor 1, the variation can be corrected.

  Thereafter, it is determined whether or not the liquid detection sensor 1 is normal. Specifically, it is determined whether or not the determined error threshold is greater than or equal to the measurement range upper limit value of the measurement device (S5). Note that this process may not be performed when infinity is allowed as the error threshold. If the determined error threshold value is not equal to or greater than the measurement range upper limit value of the measurement device (S5: NO), it is determined whether or not the determined leak threshold is equal to or less than the measurement range lower limit value of the measurement device (S6). When the determined leak threshold is not less than or equal to the measurement range lower limit value of the measuring device (S6: NO), the detection operation is started.

  When the detection operation is started, a sensor resistance value is acquired (S7). And it is determined whether the acquired sensor resistance value is more than an error threshold value (S8). If the sensor resistance value is not an error threshold abnormality (S8: NO), it is determined whether or not the acquired sensor resistance value is equal to or greater than the error threshold (S9). If the sensor resistance value is not equal to or greater than the error threshold (S9: NO), the process returns to S7 and the detection operation is continued.

On the other hand, if it is determined that there is an abnormality in each abnormality determination process of S5, S6, S8, and S9 (if the error threshold is greater than or equal to the measurement range upper limit value of the measurement device (S5: YES)), the liquid leakage threshold Is less than or equal to the measurement range lower limit of the measuring device (S6: YES), if the sensor resistance value is greater than or equal to the error threshold (S8: YES), if the sensor resistance value is greater than or equal to the error threshold (S9: YES)) The following processing is executed.
That is, in each abnormality determination process of S5, S6, S8, and S9, when it is abnormal, an alarm process is executed (S10). Specifically, the speaker 74 is controlled to output an alarm sound, and an indication that there is an abnormality is displayed on the display unit 72. Thereafter, alarm release processing is performed (S11). The alarm cancellation process is a process in which the alarm process is stopped when an administrator of the liquid detection sensor 1 or the like performs an alarm cancellation operation on the input unit 73. Then, it is determined whether or not to continue the detection operation (S12). That is, it is determined whether an operation on the input unit 73 by an administrator or the like of the liquid detection sensor 1 indicates whether or not to continue the current detection operation. In addition, what is shown on the display part 72 so that either of the said operation may be performed.

  If the input operation is to continue the current detection operation (S12: YES), the process returns to S7 and the detection operation is continued. When the input operation does not continue the current detection operation (S12: NO), this program is terminated.

  In the alarm process of S10, it is preferable that the error is notified in an identifiable manner. That is, when it is determined that there is an abnormality in each abnormality determination process of S5, S6, S8, and S9, identification information that can identify what kind of abnormality is stored in the storage means, In the processing, the sound output mode of the speaker 74 and the display mode of the display unit 72 may be varied according to the identification information. The identification information may be output to the outside via the communication interface 76.

  Moreover, the leak detection program may have a timer function. In other words, an end time may be registered at the start of the leak detection program, and an interruption may be performed to end the leak detection program when the set end time is reached. In addition, an execution time may be registered at the start of the liquid leakage detection program, the time may be counted, and an interruption may be performed to end the liquid leakage detection program when the set time is reached.

As described above, the first connector 71a to which the electrode member 5a is connected and the second connector to which one or more electrode members 5b other than the first connector 71a are connected by the measuring device 7 having a function as a measuring means. The resistance value between 71b is measured. Thereby, in a normal state, since the electrode member 5a of the first connector 71a and the electrode member 5b of the second connector 71b are connected by the resistance member 8, the measuring device 7 makes the insulating sheet 4 conductive. The resistance value by the resistance member 8 that is larger than the resistance value when exerted is detected. Further, at least a part of the insulating sheet 4 exhibits electrical conductivity due to leakage, and the electrode member 5a connected to the first connector 71a and the electrode member 5b connected to the second connector 71b are electrically connected by the insulating sheet 4. In this case, since the resistance value between the first connector 71a and the second connector 71b is lower than the resistance value by the resistance member 8, a liquid leakage state can be detected. Further, when the conduction by the resistance member 8 is released, the resistance value between the first connector 71a and the second connector 71b becomes infinite, so that the resistance member 8 is peeled off from the insulating sheet 4, for example. An error state in which the connection between the electrode members 5 is released can be detected.
As a result, it is possible to determine the leakage state or connection error state based on the resistance value, so that the cause of the failure of normal detection can be notified to the outside, and the normal state can be quickly restored. It becomes possible.

(Modification)
As mentioned above, although the liquid detection sensor 1 of this embodiment was demonstrated, it is not limited to this.
For example, as shown in FIG. 8, the liquid detection sensor may have a configuration in which the electrode member is formed of a conductive adhesive. Specifically, the liquid detection sensor 101 shown in FIG. 8 includes an insulating sheet 104, two electrode members 105 and 105, an adhesive member 106, and a resistance member 108. The electrode members 105 and 105 are laminated on the insulating sheet 104 by printing or applying a conductive adhesive layer. The resistance member 108 is stacked by being printed or applied so as to bind the electrode members 105 and 105 stacked on the insulating sheet 104. The adhesive member 106 has a configuration in which an adhesive 161 and an adhesive film 162 are laminated. The insulating sheet 104 is attached in a state where the side on which the electrode members 105 and 105 are laminated protrudes partly from the adhesive member 106 to the adhesive 161 side of the adhesive member 106. As a result, the liquid detection sensor 101 can be clamped by a clip or the like attached to the end of the signal line, and the electrode members 105 and 105 are electrically connected to the signal line. The liquid detection sensor 101 may be provided with a release sheet 103 having the same shape as the outer shape of the adhesive member 106.

  Further, as shown in FIG. 9, the liquid detection sensor may have a simple configuration in which the metal layer is not included in the electrode member. Specifically, the liquid detection sensor 201 illustrated in FIG. 9 includes an insulating sheet 204, an adhesive layer 209, a resistance member 208, two electrode members 205 and 205, and an adhesive member 206. The electrode members 205 and 205 have a configuration in which a protective layer 250 is laminated on the tip of the conductive adhesive layer 251. In the electrode members 205 and 205, a part of the tip end region where the protective layer 250 is laminated is exposed from the insulating sheet 204. That is, the portion where the conductive adhesive layer 251 is exposed from the insulating sheet 204 is conductively protected by the protective layer 250. The resistance member 208 is placed in contact with the two electrode members 205 and 205, and is bonded to the insulating sheet 204 by the adhesive property of the adhesive layer 209. The adhesive member 206 has a configuration in which an adhesive 261 and an adhesive film 262 are laminated. The liquid detection sensor 201 may be provided with a release sheet 203 having the same shape as the outer shape of the adhesive member 206.

  Thus, the liquid detection sensor 201 has a configuration in which the electrode member 205 does not include a metal layer. That is, the liquid detection sensor 201 is easier to bend or deform along the shape of the installation target than the configuration in which the electrode member includes a metal layer. Therefore, the liquid detection sensor 201 is easy to apply to the shape of the installation target and is difficult to peel from the installation target. Further, since the electrode member is only the conductive adhesive layer, the manufacturing is simple by printing, coating, and the like.

  As shown in FIG. 10, the liquid detection sensor may have a configuration in which the electrode member includes a resin layer. Specifically, the liquid detection sensor 301 shown in FIG. 10 includes an insulating sheet 304, an adhesive layer 309, a resistance member 308, two electrode members 305 and 305, and an adhesive member 306. The electrode members 305 and 305 have a structure in which a resin layer 353, a metal layer 352, a conductive adhesive layer 351, and a protective layer 350 are laminated. The electrode members 305 and 305 are partially exposed from the insulating sheet 304 at the tip end region where the protective layer 350 is laminated. That is, the portion where the conductive adhesive layer 351 is exposed from the insulating sheet 304 is protected by the protective layer 350. The resin layer 353 is laminated in a region opposite to the side where the protective layer 350 is laminated. That is, the resin layer 353 is not laminated at the tip portion of the electrode member 305 on the side where the protective layer 350 is laminated. The resistance member 308 is placed in contact with the two electrode members 305 and 305, and is bonded to the insulating sheet 304 by the adhesive property of the adhesive layer 309. The adhesive member 306 has a configuration in which an adhesive 361 and an adhesive film 362 are laminated. The liquid detection sensor 301 may be provided with a release sheet 303 having the same shape as the outer shape of the adhesive member 306.

  As described above, the liquid detection sensor 201 is configured such that the conductive adhesive layer 351 is protected by the protective layer 350 and the resin layer 353 is not laminated at the tip of the electrode member 305 exposed from the insulating sheet 304. Yes. When the measuring device 7 is connected to the liquid detection sensor 301, the tip of the electrode member 305 may be sandwiched with a clip or the like attached to the end of the signal line of the measuring device 7, which facilitates connection.

  Further, as shown in FIG. 11, the liquid detection sensor has a configuration in which a through-hole is formed in the adhesive member, and the tip of the electrode member is inserted into the through-hole and protrudes to the opposite surface. May be. Specifically, the liquid detection sensor 401 illustrated in FIG. 11 includes an insulating sheet 404, an adhesive layer 409, a resistance member 408, two electrode members 405 and 405, and an adhesive member 406. The electrode members 405 and 405 have a structure in which a metal layer 452 and a conductive adhesive layer 451 are laminated. Note that the conductive adhesive layer 451 is not laminated on the tip portions of the electrode members 405 and 405. The resistance member 408 is placed in contact with the two electrode members 405 and 405 and bonded to the insulating sheet 404 by the adhesive property of the adhesive layer 409. The adhesive member 406 has a configuration in which an adhesive 461 and an adhesive film 462 are laminated, and through holes 463 and 463 penetrating the adhesive 461 and the adhesive film 462 are formed. The liquid detection sensor 401 may be provided with a release sheet 403 having the same shape as the outer shape of the adhesive member 206.

  The metal layer 452 includes an adhesive portion 452a and a lead portion 452b. The bonding portion 452 a is a portion where the conductive adhesive layer 451 of the metal layer 452 is laminated, and is bonded to the pressure-sensitive adhesive 461 of the pressure-sensitive adhesive member 406. The lead portions 452b of the electrode members 405 and 405 extend from the bonding portions 452a, and are inserted into the two through holes 463 and 463 formed in the adhesive member 406 from the connection portions with the bonding portions 452a, respectively. It is supposed to be located on the surface. The adhesive portions 452 a of the electrode members 405 and 405 are held by the viscosity of the adhesive member 406 and are entirely covered with the insulating sheet 404. In other words, the adhesive member 406 is formed in a sheet shape having a through-hole 463, and the electrode members 405 and 405 each hold the adhesive portions 452 a on one side of the adhesive member 406, and each drawer The part 452b is configured to be positioned on the other surface side through the through holes 463 and 463.

  In this way, after attaching one surface side of the adhesive member 406 in the liquid detection sensor 401 to a desired location in a contact state, the end portions of the lead portions 452b which are the electrode members 405 and 405 positioned on the other surface side are signaled. Since the liquid detection sensor 401 can be used as a terminal, a series of setting operations from attachment to detection can be performed easily and in a short time.

Moreover, as shown in FIG. 12, the liquid detection sensor may be configured such that the tip of the electrode member is located outside the adhesive member. Specifically, the liquid detection sensor 601 shown in FIG. 12 includes an insulating sheet 604, an adhesive layer 609, a resistance member 608, two electrode members 605 and 605, and an adhesive member 606. The electrode members 605 and 605 are configured such that a metal layer 652 and a conductive adhesive layer 651 are stacked, and a protective layer 650 is stacked only at the tip. In addition, you may be covered with the protective layer except the location electrically connected with the terminal of a clip when pinched | interposed with a clip. For example, in FIG. 12, the electrode member 605 in a range protruding outward from the adhesive member 606 is sandwiched by clips. In this case, a part of the surface on the metal layer 652 side of the electrode member 605 is electrically connected to the terminal of the clip. Accordingly, a portion of the metal layer 652 that is bonded to the adhesive 661 may be covered with a protective layer.
A part of the distal end portion of the electrode member 605 is exposed from the insulating sheet 604, and the distal end reaches the outside of the adhesive member 606. The resistance member 608 is placed in contact with the two electrode members 605 and 605, and is bonded to the insulating sheet 604 by the adhesiveness of the adhesive layer 609. The adhesive member 606 has a configuration in which an adhesive 661 and an adhesive film 662 are laminated. The liquid detection sensor 601 may be provided with a release sheet 603 having the same shape as the outer shape of the adhesive member 606.

  As described above, the liquid detection sensor 601 is configured such that the tips of the electrode members 605 and 605 are located outside the adhesive member 606. Therefore, the electrode members 605 and 605 that protrude from the outside of the adhesive member 606 can be used as signal terminals after the one surface side of the adhesive member 606 in the liquid detection sensor 601 is attached to a desired location in contact. As 601, a series of setting operations from attachment to detection can be performed easily and in a short time.

  Moreover, although this embodiment demonstrated the structure which has two electrode members in a liquid detection sensor, it is not limited to this. For example, a configuration in which three or more electrode members are provided may be used. When a plurality of electrode members are provided, a plurality of electrode members may be connected to the first connector and the second connector of the measuring device. That is, at least one of the plurality of electrode members is connected to the first connector, and at least one of the plurality of electrode members is connected to the second connector, and the electrode member connected to the first connector is connected to the first connector. Is connected to another electrode member. Further, the shape of the electrode member is not limited to a quadrangular shape, and may be a polygonal shape such as a triangular shape or a pentagonal shape, an elliptical shape or a circular shape, or a linear shape. May be.

  In the above detailed description, the present invention has been described mainly with respect to characteristic parts so that the present invention can be more easily understood. However, the present invention is not limited to the embodiments described in the above detailed description, and other implementations are possible. It can also be applied to forms and its scope should be interpreted as widely as possible.

  The terms and terminology used in the present specification are used to accurately describe the present invention, and are not used to limit the interpretation of the present invention. Moreover, it would be easy for those skilled in the art to infer other configurations, systems, methods, and the like included in the concept of the present invention from the concept of the invention described in this specification. Accordingly, the description of the claims should be regarded as including an equivalent configuration without departing from the technical idea of the present invention. In addition, in order to fully understand the object of the present invention and the effects of the present invention, it is desirable to fully consider the literatures already disclosed.

DESCRIPTION OF SYMBOLS 1 Liquid detection sensor 2 Installation object 3 Release sheet 4 Insulation sheet 5 Electrode member 6 Adhesive member 7 Measuring device 71a 1st connector 71b 2nd connector 8 Resistance member 9 Adhesive layer 50 Protective layer 51 Conductive adhesive layer 52 Metal layer 53 Resin Layer 61 Adhesive 62 Adhesive film

Claims (8)

Conductivity is exhibited by the intervention of blood or liquid chemicals, and a non-woven structure, a porous structure, a structure in which one or more holes are formed in a non-porous material, or one or more slits are formed in a non-porous material. And an insulating sheet whose material is cellulose, ceramic or engineering plastic ,
A plurality of electrode members having electrical conductivity and adhesiveness, provided in contact with one surface of the insulating sheet by the adhesiveness, and electrically separated from each other;
A resistance member connected so as to tie the electrode members together,
The resistance member has a resistance value larger than a resistance value when the insulating sheet exhibits conductivity, and is smaller than a resistance value when the connection between the electrode members by the resistance member is released. It has a resistance value and is formed by printing conductive ink on the insulating sheet,
The liquid detection sensor, wherein the conductive ink is carbon ink, metal oxide, or metal deposition pulverized material . The liquid detection sensor according to claim 1, wherein the resistance member is formed by transferring conductive ink printed on a base material.   The liquid detection sensor according to claim 1, wherein the resistance member is a thin film layer including a resin and conductive particles. It said electrode member, the liquid detection sensor of claim 2 or 3, characterized in that it is formed by printing or applying a conductive adhesive to said insulating sheet and the resistance member. It said electrode member further claim 4 wherein the layer formed by printing or applying the conductive adhesive and the insulating sheet side, characterized in that it comprises a metal layer laminated on the opposite side The liquid detection sensor described in 1. A first connector for connecting at least one of the plurality of electrode members;
A second connector that connects at least one of the plurality of electrode members and an electrode member different from the electrode member connected to the first connector;
Liquid detecting sensor according to any one of claims 1 to 5, characterized in that it further includes a measuring means for measuring the resistance value between the second connector and the first connector.   The liquid detection sensor according to claim 1, wherein the electrode member and the resistance member are provided in contact with one surface of the insulating sheet by transfer printing. Conductive adhesive layer of the plurality of electrode members is, in any one of claims 4 to 7, characterized in that it has the conductivity and adhesion by a conductive adhesive comprising an adhesive The liquid detection sensor described.

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